Google have made changes to the way secure search works for users logged into Google.com. Any search performed whilst a user is logged into a Google account will be done on a secure socket layer (SSL). This change also means that these searches won’t pass on any search term referrer data.
Google claim that “As search becomes an increasingly customized experience, we recognize the growing importance of protecting the personalized search results we deliver. As a result, we’re enhancing our default search experience for signed-in users.”
Whilst Google is claiming that it is making the move to better protect user privacy, search term referrer data will still be passed on to advertisers who use their PPC product. This has left the some of the SEO community unhappy, with claims that Google are effectively saying that you can have the search referrer data but only if you pay for it.